Travis CI support for Crystal is contributed by the community and may be removed or
altered at any time. If you run into any problems, please report them in the
Travis CI issue tracker
and cc @asterite,
@jhass,
@waj, and
@will in the issue.

By default Travis CI will use the latest Crystal release. It is also possible
to test projects against the nightly build of Crystal. To do so, set the
crystal key in .travis.yml. For example, to test against both nightly and
the latest release: